<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <input type="text" placeholder="请输入班级名称" id="input">
    <input type="button" value="添加" onclick="sendAjax()">
    <script>
        function sendAjax(){
            let xhr=new XMLHttpRequest();
            let className=document.getElementById("input").value;//获取输入进来的文本值
            xhr.open("get","/insertClass?name="+className);
            xhr.onload=function(){
               console.log(xhr.responseText);
            };
            xhr.send();
        }
    </script>
</body>
</html>